Home / 81,854.21-122,780.86-21,064.43

Finding the Fourth Proportional to 81,854.21, 122,780.86 and 21,064.43

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Solution

The fourth proportional to 81,854.21, 122,780.86 and 21,064.43 is: 31,596.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,854.21 : 122,780.86 = 21,064.43 : x
  2. Step 2: Convert to fraction form
    81,854.21/122,780.86 = 21,064.43/x
  3. Step 3: Cross multiply
    81,854.21x = 122,780.86 × 21,064.43
  4. Step 4: Simplify right side
    81,854.21x = 2,586,308,830.81
  5. Step 5: Solve for x
    x = 2,586,308,830.81/81,854.21
  6. Step 6: Final answer
    x = 31,596.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.